data: Add Huion Kamvas 12

[ColinKinloch]

The layout is the same as the Kamvas 13 so I copied it and edited the id on the svg.

[github-actions[bot]]

Hi, there. I'm a bot and have been asked to have a look at this.

Please run the sysinfo script from https://github.com/linuxwacom/wacom-hid-descriptors and file a new issue in that repo with the resulting sysinfo tarball. The README in that repo has more information and instructions.

The .tablet files in this PR should then link to the sysinfo in this form:

# sysinfo.abCdE1234.tar.gz
# https://github.com/linuxwacom/wacom-hid-descriptors/issues/1234

A git grep sysinfo will show how this is currently used in existing data files.

See also https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device

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[whot]

Closing, please re-open when updated with the requested information. Thanks.